#include <stdio.h>
/**
 * OneThree.c
 * This program prints one, two, three.
 *  It demonstrates function calls.
 *  It uses a simple function prototype.
 *  It defines three functions.
 *  The one_three function calls the one and two functions.
 *  The main function calls the one_three function.
 *  The one function prints one.
 *  The two function prints two.
 *  The one_three function prints three.
 *  The main function prints starting now: and done!
 */
void one(void);
void two(void);
void one_three(void);
int main(void)
{
    printf("starting now:\n");
    one_three();
    printf("done!");
    return 0;
}
void one(void)
{
    printf("one\n");
}
void two(void)
{
    printf("two\n");
}
void one_three(void)
{
    one();
    two();
    printf("three\n");
}
